Electro-magnetic pulley



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W. E.. H ARRINGTON.

I BLBGTRO MAGNETIC PULLBY. No. 487,070.. Patented Nov. 29, 1892.

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10,487,070 'Patented Nov. 29, 1892,.

' NrTnD STATES PATENT Crricn.

IVALTER E. HARRING'ION, OF lATLANTIC CITY, NEW JERSEY, ASSIGNOR TO FRANCIS T. CHAMBERS, OF PHILADELPHIA, PENNSYLVANIA.

ELECTRO-MAG N ETlC PU LLEY.

SPECIFICATION forming part of Letters Patent No. 487,070, dated November 29, 1892.

Application led J' une 2, 1891.

To @ZZ whom, it may concern.'

Be it known that I, WALTER E. HARRING- TON, of Atlantic City, county of Atlantic, State of New Jersey, have invented a certain new and useful Electro-lllagnetic Pulley, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part of this specification.

My invention relates to the transmission of power through electro-magnetic pulleys, and is an improvement upon the device described by me in my application for Letters Patent, iiled October 4, 1890, Serial No. 367,055.

The object of my present invention is to simplify and improve the construction and especially the mode of connection ofthe magnetic pulleys.

The nature of the invention will be best understood as described in connection with the drawings in which it is illustrated, and in which-` Figure l is an elevation showing a carpropelled by an electric motor provided with my device for transmitting motion from the motor to the axles. Fig. 2 is an end view of the said car; Fig. 3, a side elevation of my improved magnetic pulley, taken on the sectionline x a; of Fig. 4; Fig. 4, a cross-sectional elevation taken on the line y y of Fig. 3; Fig. 5, an enlarged view or diagram showing the electrical connections between the commutator of the motor-armature, the pulleys, and track. Fig. 6 is a plan view of the belt used in connection with my motor; Fig. 7, an edge view of the same; Fig. 8, a diagram illustrat-A ing the mode of construction of the belt; Fig. 9, a side elevation of the modified form of electro-magnetic pulley, and Fig. 10 a crosssectional View of the modied pulley on the line z z of Fig. 9.

A is the car; B, the electric motor; C, the driving-shaft, actuated by the motor; D D, electromagnetic pulleys secured to the shaft C and also to the car-axles J.

. E is the wire through which the electric current is carried; F, the trolley of the car; G, the wire leading from the trolley to the switch H; G', the wire leading from the switch H to the electric motor; G2, the wire leading from the magnet-coils of the motor to the ar- Serial No. 394,862. (No model.)

mature; G3, the wire leading from the armature to the shaft Referring now toFigs. 3 and 4, which illustrate the constructionof the electro-magnetic pulleys, D is the hub of the pulley, made of iron or other conducting material and fastened to the shaft C or the axle J, as the case may be. D2 is the pulley center, made ot' some non-conducting material, which is bolted to the hub D and to which is bolted the pulley-rim D5, which is made of iron or other material which is an electric conductor, and which is made magnetic by the passage ofa-n electric current through suitable windings upon or connected with it.

In the plan shown in Figs. 3 and 4 the pulley-rim is made magnetic by means of circumferential windings, as indicated at D4, and in the modified plan shown in Figs. 9 and lO the rim is made magnetic by windings around projections extending out from the body of the ring, the latter device being that illustrated in my former application for Letters Patent. Any suitable windings which will have the effect of magnetizing the rim may of course be used. The windings upon the pulley-rim are connected at one end with the pulley center by means of a wire G4, and the other end of the rim-windings is connected with the rim itself, as indicated at g4. The shaft upon which the pulley is secured is of iron, steel, or other conducting material, and the pulley receives the current Iirst through its hub, then through the Wire G4 into its windings D4, and then through the Wire connection g4 the rim itself is brought into the circuit.

As in my former application, a belt of iron or other conducting and magnetic material is placed over the magnetic pulley and preferably over asimilar pulley upon the countershaft-as, for instance, the axle J. The electric current passes from the pulley rim through the belt (indicated by I in the drawings) to the rim of the pulley on the countershaft, from the rim through connections g4 to the windings D4, then through connection G4 to the hub, thence to the shaft, as J, and thence through the wheels K to the track L, which serves as the return-conductor to the source of electrical supply. The belt which IOO I prefer to use and have found excellent for the purpose is made up of woven Wire, as indicated at I in the drawings, and along the inner face of this I rivet cross-bars I3, the rivets passing through the interstices of the wire, and preferably passing, also, through bars I2 on the outer side of the belt. The bars I3 rest against the pulleys and are attracted to the faces thereof with a power proportioned to the amount of current passing through the windings, or, in other words, to the magnetic attraction of the rim. The current from the rim also passes through the bars, and thence from the woven-wire portion I of the belt to the pulley on the counter-shaft.

It will be understood of course that the shaft C and aXlcs J of the car must be insulated from each other, so that the current when passing through the pulleys must follow the path described.

The simplicity of the arrangement which I have described is of course apparent and the advantages arising from my being able to electricallyconnect the pulley with the source of electricalsupply through the shaft upon which cuit are manifest and need not be particularly pointed out further than to call attention to the fact that I entirely dispense with collecting rings and brushes.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. An electro-magnetic pulley havingarm of conducting material made magnetic by suitable windings, a hub of a conducting Inaterial, a wheel center of non-conducting material, a connection from the hub to the windings of the rim, and a connection from the windings to the rim.

2. In a car, the combination of an electric motor, a drivingshaft actuated by the motor and constituting part of the motor-circuit, an electro-magnetic pulley secured on said shaft, said pulley having a hub and rim of conducting material, the rim being made magnetic by suitable windings, said pulley having, also, a center of insulating material, electric connection between the hub and rim windings and between the said windings and the rim, a car-axle having a similar pulley secured to it, and a belt of conducting material running over the two pulleys, all substantially as and for the purpose specified.

3. In combination with an electro-magnetic pulley, a belt I, of woven \wire, having iron armature-bars Is secured to its inner face by 1 rivets passing through the interstices of the wire, substantially as and for the purpose l specified.

it runs or through said shaft to the return-cir j 4. In combination with an electro-magnetic pulley,a belt I, of woven wire, havingiron armature-bars I3 secured. to its inner face by rivets passing through the interstices of the wire and through bars placed opposite to the armatures on the outside of the belt.

WALTER E. HARRINGTON. Witnesses:

LISLE S'roKns, JOSHUA MATLACK, J r. 

